Casting and trimming mechanism for typographic machines



Oct. 7 1924. 1,510,788

F. w. LETSCH CASTING AND TRIMMING MECHANISM FOR TYPOGRAPH IC MACHINES Filed March 5, 1932 Patented Oct. 7, 1924.

stares FREDERICK W. LETSCH, OF BALTIMORE, MARYLAND.

CASTING AND TRIMMING MECHANISM FOR TYPOGRAPHIC MACHINES.

Application filed March 3 1922.

To all whom it may concern:

Be it known that I, FREDERICK W. LETSCH, a citizen of the United States, and residing at Baltimore, city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Casting and Trimming Mechanism for Typographic Machines, of which the following is a specification. I

This invention relates to casting and trimming mechanism for typographic machines.

The object of the invention is to provide an improved and simplified arrange ment by which the type or slugs are cast with a small amount of metal adhering thereto and by which such adhering metal may be easily and perfectly trimmed from the'foot or base of the type or slugs.

In the drawings accompanying this specification and forming a part thereof there is illustrated one embodiment of the improved arrangement for accomplishing the foregoing results. In said drawings,

Figure 1 is a detached view showing in elevation a portion of a mold mechanism of a typographic machine with the present invention applied thereto.

Figure 2 is a side elevation of the mecha nism illustrated in Figure 1.

Figure 3 is a vertical sectional view on the line 33 of Figure 1, and,

Figure 4 is a top plan view of the lower nipple plate hereinafter described.

Referring to the drawings in detail, 10 represents the upper jaw and 11 the lower jaw of a mold mechanism for a typographic machine between which jaws there is formed a mold cavity M in which the slugs are to be cast. By any well known means one of these jaws may be made adjustable toward the other to permit casting slugs of different thicknesses. A body piece or ejector 12 is arranged between the upper and lower mold jaws, this body piece being adapted to slide transversely of the jaws to eject the cast slugs therefrom. This body piece or ejector may be operated in the usual manner and its action is so timed as to eject the slugs from the mold after the casting operation takes place. At the rear of the mold blocks 10 and 11 and positioned against the same there is arranged an upper nipple plate 13 and a lower nipple plate 14, these plates forming a member against Serial No. 540,819.

which the pot containing the molten metal may be pressed, this member being recessed as at 15 to receive the mouth of the pot. To permit the molten metalv tobe injected into the mold cavity M, a slot 16 is formed between the nipple plates, this slot being positioned.- opposite the inner end of the mold cavity and bein somewhat narrower next to the mold cavity than the minimum distance between the upper and lower mold jaws. Preferably! the slot 16 is formed in the following manner; The upper edge of the lower, nipple plate 14: is cut away as illustrated particularly in Figures 1 and 1 of the drawing, such cut away portion being of a length equal to the width of the mold. The upper portion of this slotv is straight being formed by the lower edge of the upper nipple plate while the bottom of this slot is downwardly inclined away from the mold cavity M, such inclined bottom of the slot being indicated at 18 in the drawing. The result is that the slot 16 is Wedge shaped, the narrowest portion thereof be-' ing arranged adjacent the mold cavity M. At the end of the slot 16 adjacent the end of the mold cavity from which the cast slugs are ejected, there is provided a knife edge 20, this knife edge preferably being produced by undercutting the end of the slot 16 so that the knife edge forms an integral part of the nipple plate-14..

From the foregoing construction it will be understood that when slugs are cast in the mold cavity M'a certain portion of the metal will adhere thereto. The adhering portion or sprue thus formed on the cast slugs by the slot 16 will of course have substantially the shape of the slot, in other words, the sprue will be wedge shaped. This is an important feature of the inventionsince a sprue of that shape and character w-illserve to hold the slug or type from transverse movement while the same is being ejected 'endwise from the mold. As the cast slugs are ejected from the mold by the action of the body piece or ejector 12 the knife edge 20 formed at the end of the slot 16 will act to cut the adhering portion or sprue therefrom and since the slugs are held from lateral movement while being ejected it follows that this knife edge will completely! and effectively trim the adhering portions of the metal from the foot or base of the slugs. After the slugs are thus ejected from the mold cavity past the knife edge 20, they are completely trimmed from adhering metal and further trimming of the same is unnecessary. 7

What I claim and desire to secure by Let ters Patent is:

1. In a construction of the kind described, in combination, an upper mold jaw and a lower mold jaw arranged to form a mold cavity between the ame, a member arranged adjacent said jaws and having a slot through which molten metal is injected into said mold cavity, means movable between said jaws and parallel to the length of said slot for ejecting cast slugs from said mold cavity, one end of said slot being pro vid'ed with a cutting edge whereby the sprue formed on the slug by said slot will be cut therefrom as the slug is ejected from the mold cavity.

2. In a construction of the kind described, in combination, an upper mold jaw and a lower mold jaw arranged to form a mold cavity between the same, a member arranged adjacent said jaws and having a slot through which molten metal is injected into said mold cavity, said slot being of gradually decreasing width from the rear toward the front thereof whereby a wedgeshaped sprue is formed at the base of the slugs cast in the mold cavity, means movable between said jaws and parallel to the length of said slot for ejecting cast slugs from said mold cavity, one end of said slot being provided with a cutting edge where by the sprue formed on the slug by said slot will be out therefrom as the slug is ejected from the mold cavity.

3. In a construction of the kind described, in combination, an upper mold jaw and a lower mold jaw arranged to form a mold cavity between the same, a member arranged adjacent said jaws and having a slot through which molten metal is injected into said mold cavity, said slot having the bottom thereof inclined downwardly away from said mold cavity, means movable between said jaws and parallel to the length of said slot for ejecting cast slugs from said mold cavity, one end of said slot being provided with a cutting edge whereby the sprue formed on the slug by said slot will be cut therefrom as the slug is ejected from the mold cavity.

4. In a construction of the kind described, in combination, an upper mold jaw and a lower mold jaw arranged to form a mold cavity'between the same, an upper nipple plate and a lower nipple plate arranged at the rear of said jaws, the edge of one of said nipple plates being cut away to form a slot through which molten metal is injected into said mold cavity, a body piece nmvable between said jaws and parallel to the length of said slot for ejecting cast slugs plate and a lower nippleplate' arranged at the rear of said jaws, the edge of one of said nlpple platesbeing cut away to form a slot through which molten metal is injected into said mold cavity, said slot being wedge-shaped and having its narrowest portion adjacent said mold cavity and its bottom inclined downwardly away from] said mold cavity, a body piece movable between said jaws and parallel to thelength of'safi'd slot for ejecting. cast slugsfr'om said mold cavity, one end of said slot being'shaped to form a cutting edge wherebygthe sp'rue formed on the slugs by said slot will; be cut therefrom as the slugs are ejected from the mold. I v v 6. In a construction of the kind described, in combination, an upper mold jaw and a lower mold jaw arranged to form a mold cavity between the same, an upper nipple plate and a lower nipple plate arranged at the rear of said jaws, the upper edgcf'of said lower nipple plate being cut away to form a slot through which m'olten metal is injected into said mold cavity, a body piece movable between said jaws and parallel to the length of said slot for ejecting cast slugs from said mold cavity, one endfo'f said slot being shaped to form a cutting edge whereby the sprue formed on the slugs by said slot will be cut therefrom" as the slugs are ejected from the mold. x

7. In a construction of the kind: described, in combination, an upper mold jaw and a lower mold arranged to form' a mold cavity between the same, anupper nipple plate and a lower nipple plate arranged at the rear of said jaws, the upper edge of said lower nipple plate being cut away to form a slot through which molten metal is injected into said mold cavity, the bottom of said slot being inclined downwardly and away from said mold cavity, a body piece movable betweensaid jaws and parallel to the length of said slot for ejecting cast slugs from said mold cavity, one end of said slot being shaped to form a cutting edge where by the sprue formed on the slugs by said slot will be cut therefrom as the slugs are ejected from the mold.

8. In a construction of th'ekind described, in combination, an upper mold jaw and a lower mold jawarranged to form amold cavity between the same, an upper nipple plate and a lower nipple plate arranged at the rear of said jaws, and: cutaway tofo'rm Iran tee

a recess for receiving a pm mouth, the edge ofsaid slot being shaped to form a cutting of one of said nipple plates being cut away sedge whereby thesprue formed on the slugs to form a slot through fi vhich molten metal bly said slot willg be cut therefrom as the 10 is injected into said mijld cavity a body 3 ugs are ejected' 'from the mold.

piece movable between siii'd jawsand ,paral- In testimony; whereof I hereunizo aflix my lel to the length of said-':slot gjiior ejecting signature.

east slugs from said mold Quality, one. end v e FREDERICK-W. LETSCH. 

